Closure top for containers



Dec. 31, 1935. w. F. PUNTE CLOSURE TOP FOR CONTAINERS Filed May 11, 1934 3 wucm toaa Skim/M1 3 S WLQMW 7 U Patented Dec. 31, 1935 CLOSURE TOP FOR CONTAINERS William F. Punte, Syracuse, N. Y., assignor to Continental Can Company, Inc., New York, N. Y., a corporation of New York Application May 11, 1934, Serial No. 725,149

2 Claims.

The invention relates to new and useful improvements in a metal closure for containers of the. friction plug type and the method of making the same.

Anobject of the invention is to provide a container wherein the closure top is provided with a. depending vertical wall serving as a friction seat fora friction plug, and wherein the opening at the lower end of said vertical wall is closed by a frangible sealing disk which contacts with the lower edge of the wall, extends up along the outer face of said depending wall, and is clamped between folded metal parts formed in the can top adjacent the depending wall.

A further object of the invention is to provide a method of forming a metal closuretop for containers wherein the sealing disk closing the opening at the lower end of the vertical friction wall seat for the sealing plug may be clamped and drawn tight against the lower edge of said wall by a folding of the metal parts in thacontainer top adjacent the upper end of the depend- I ing member forming the friction seat.

In the drawing- Figure l is a view partly in side elevation and partly in vertical section showing a container embodying the improvements. with the friction plug in place; I

Fig. 2 is a view showing the blank as die-drawn so as to provide a depressed portion in the container top, with spaced vertical walls, one of which extends above and below the depressed portion of the container top and is to serve as the friction seat for the friction plug;

Fig. 3 is a view similar to Fig. 2, but showing the central. portion of the blank cut out to form an opening and the lower edge of the vertical depending Wall curled to provide a smooth edge;

Fig. 4' is a view of asealing disk which is drawn so as to provide a flange extending at right angles to the plane of the disk;

Fig. 5 is a view showing the. sealing disk and the container top assembled, preparatory tothe bending or folding of the metal parts to secure the sealing disk firmly to the can top;

Fig. 6 is a vertical sectional view through the finished container top ready for attachment to the body portion of the container, and

Fig. 7 is a view similar to Fig. 3, but showing a sealing composition in the recess between the spaced walls which receives the flange of the sealing disk, and which will aid in the forming of a tight seal when said sealing disk is clamped between the walls.

The invention is directed to a closure top for a container of the friction plug type and the method of making the same. It is believed that the novel features of the container top closure will be better understood by a description of the method of making the same. The closure top is formed from a sheet of metal in the usual way, by cutting from said sheet a blank which is diedrawn to give the proper shape to the container top. In Fig. 2 of the drawing, the blank is shown as drawn so as to provide a channel portion 1 which receives the flange of the container body and is rolled with the flange into a seam for the joining of the container top to the container body. The blank as shown in Fig. 2, is also provided with a depending portion 2 forming a depression in the container top. This depending portion extends down along the inside wall of the container body, as shown in Fig. 1. The depressed portion 3 formed by this drawing operation is shaped so as to provide an upstanding vertical wall 4 which is integrally connected with a depending vertical wall 5. The vertical wall 5 extends below the plane of the depressed portion 3. These walls are closely spaced and are parallel with each other and are adapted to receive therebetween the flange of the sealing disk, and. eventually serve as the clamping members which secure the sealing disk to the closure top. The blank, asshown in Fig. 2, is provided with a central portion 6 which is, of course, cut out to form an opening, and the lower edge of the depending wall 5 is curled as indicated at 1 (Fig. 3) so as to provide a smooth edge at the under face thereof. The sealing disk, as shown in Fig. 4, may be made of any frangible material, but is preferably made of aluminum. Said sealing disk is indicated at 8 and is shaped so as to provide a flange 9 extending at right angles to the plane of the sealing disk. This flange is dimensioned as to diameter so that it will closely fit the outer face of the depending wall 5. It is dimensioned as to length so that when the disk closes the opening and contacts with the smooth lower edge of the depending wall 5, it will reach well up in between the wall 4 and the portion of the wall 5 extending above the depressed portion 3 of the container top. After the parts have been formed in the manner above described, then they are assembled by placing the formed sealing disk over the depending wall 5, as shown in Fig. 5 of the drawing. When thus assembled, the disk contacts with the smooth edge formed by a curl i,

and as noted above, it also contacts with the outer face of the depending wall 5 and lies between the wall 4 and the upper portion of the wall 5. After the parts are thus assembled, the portion of the wall 5 above the depressed portion 3, and the wall 4, together with that portion of the flange of the sealing disk which extends between the walls, are turned down into parellelism with the portion 3 of the container top. After the walls are turned down into parallelism, they are bumped tight against each other and against the sealing disk so as to firmly clamp the same. The sealing disk is held tight against the smooth lower edge of the depending wall 5 during the turning down of the flange and the clamping walls, and therefore, said sealing disk will be tightly clamped against said smooth edge. In fact, the turning down of the walls and the expanding of the flange will draw the sealing disk into tight contact with said smooth edge and produce a drum-tight closure for the opening in the closure top. In Fig. 7 of the drawing, there is shown a sealing material H) which is placed in the recess between the walls 4 and 5 and which will aid in producing a tight hermetic seal when the walls are turned down and bumped tight against the flange of the sealing disk. The closure top is also provided with a sealing material ll of the usual character which is rolled into the double seam when the closure is attached to the body of the container.

In Fig. 1 of the drawing, a portion of the completed container is shown, and the body wall is indicated at l2. The closure top is secured thereto by a rolling of the channel portion l and the flange on the body wall into a double seam which is indicated at l3. It will be noted that the sealing disk 8 in the finished container extends entirely across the opening at the lower end of the depending friction wall 5. This depending friction wall 5 receives the usual friction plug which is shown at M in the drawing. The flange 9 of the sealing disk extends up along the outer face of the wall 5 and is clamped by a folding of the metal parts as described above. This turns the upper portion of the flange outward as indicated at 9a, and it is tightly clamped between the walls 4 and the portion of the wall 5 which was turned down, and which is indicated at 5a. This clamping of the sealing disk with the same in firm contact with the smooth edge of the depending wall 5 enables said sealing disk to be readily cut out by the user by the passing of a sharp instrument around the opening contacting with the curled portion 1. When the sealing disk is cut out, the edge thereof will be protected by the curl so as not to, in any way, interfere with the free access to the container. The container closure end as described above is made by the container manufacturer, and the friction plug placed, after which the product is placed in the container and the bottom end of the container secured thereto by double seaming. The customer purchasing the container with the product therein removes the sealing disk, as noted above, and the friction plug is then used as a reclosure for the container.

From the above it will be apparent that a container closure has been provided which has a very durable supporting means for a frangible closure, and wherein an hermetic seal may be produced between said closure and said container top. It will also be noted that the container top and the sealing disk may be constructed and assembled and joined by die-drawing and punching operations.

It will be obvious that minor changes in the details of construction of the closure top for the container and the method of making the same may be made without departing from the spirit of the invention as set forth in the appended claims. While the sealing disk is referred to as made of aluminum, it will be understood that it may be made of any suitable frangible material, such as Taggers tin, paper or the like, but a metal sealing disk is preferable in view of its durability.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is-

1. A metal container including a body portion, a can top secured thereto by seaming, said can top having an opening therethrough and a vertical depending friction wall surrounding said opening, a friction closure adapted to engage said friction wall for closing said container, the lower edge portion of said depending wall being shaped to provide a rounded shoulder, said can top between said vertical friction wall and said seam having the metal thereof shaped to form a pocket to receive the peripheral edge portion of a sealing disk, and a sealing disk of frangible material extending across said opening contacting with said rounded shoulder and having the peripheral portion thereof disposed Within said pocket, said pocket being dimensioned so that the walls thereof grip the peripheral edge portion of said sealing disk for securing the same to said can top.

2. A metal container including a body portion, a can top secured thereto by seaming, said can top having an opening therethrough and a vertical depending friction wall surrounding said opening, a friction closure adapted to engage said friction wall for closing said container, the lower edge portionof said depending wall being shaped to provide a rounded shoulder, said can top between said vertical friction wall and said seam having the metal thereof shaped to form a pocket to receive the peripheral edge portion of a sealing disk, the walls of said pocket being substantially horizontal with the opening leading thereto being disposed adjacent the outer face of the vertical friction wall, and a sealing disk of frangible material extending across said opening contacting with said rounded shoulder, thence extending upwardly along the outer face of the vertical friction wall and into said pocket, said pocket being dimensioned so that the walls thereof grip the peripheral edge portion of the sealing disk' for securing the same to said can top.

VWLLIAM F. PUN'I'E. 

